//package com.cn.demo4.util;
//import com.alibaba.fastjson.JSONObject;
//
//import javax.servlet.*;
//import javax.servlet.annotation.WebFilter;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
//import javax.servlet.http.HttpSession;
//import java.io.IOException;
//
///**
// * 过滤器
// * /* 代表所有路径都拦截
// */
//
//@WebFilter("/*")
//public class MyFilter implements Filter {
//    @Override
//    public void init(FilterConfig filterConfig) throws ServletException {
//
//    }
//
//    /**
//     * 过滤
//     */
//    @Override
//    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//        //1.乱码问题
//        HttpServletRequest req = (HttpServletRequest) servletRequest;
//        HttpServletResponse resp = (HttpServletResponse) servletResponse;
//        req.setCharacterEncoding("UTF-8");
//        resp.setCharacterEncoding("UTF-8");
//        resp.setContentType("");
//
//        //登录，注册页面不能拦截，只能拦截后台访问地址
//        String path = req.getServletPath();
////        System.out.println(path);
//        //只要是以/admin开头的后台接口，都要过滤拦截
//        if(path.startsWith("/admin/")){
//            HttpSession session = req.getSession();
//            String key = req.getParameter("loginPhone");
//            String phone = (String) session.getAttribute(key);
//            //2.判断是否登录
//            if(phone == null){
//                JSONObject jsonObject = new JSONObject();
//                jsonObject.put("result","noLogin");
//                resp.getWriter().println(jsonObject);
//            }else {
//                //放行
//                filterChain.doFilter(req, resp);
//            }
//        }else{
//            //放行
//            filterChain.doFilter(req, resp);
//        }
//
//    }
//    @Override
//    public void destroy() {
//    }
//}
